Basic-Coated Electrodes, Low-Hydrogen, 3.2 mm Dia.BlueShield Shielded metal arc welding provide the best possible weld quality Leader in the Canadian market, the BlueShield line meets high quality standards The low volume hydrogen diffusion from the weld deposit considerably reduces the tendency to underbead (cold) cracking Ideal for boiler and pressure vessel work, structural fabrication, and more Allows welding of "difficult to weld" steels with less preheat requirements than is required for non